Fast service assured in derbyshire. You can’t compromise when it comes to your family’s safety and health that’s why we offer you important savings on our industry-best plumbing service. Combi boilers deliver hot water to the taps and showers, so that users are able to enjoy warm water without the need of a pump other benefits which make combi boilers a favourite is that they are relatively easy to install, and saves a person both time and money, since it does not require a tank to be.